In order to test if the single player stuff is working correctly again, I need a save game from any of the campaigns that is *just* before whatever transition that breaks occurs. Does anyone have one of these?

I just recently played through the OC again and did notice some odd transitions. I believe it occurred just as I was being let in to Blacklake. Nevalle (or whoever) started talking to me about Fihelis and the possible sting operation even though I had went the shadow thief route. I believe previously this was only an option for the city watch route, but I could be mistaken. Nevalle started talking about the Fihelis quest and I got a journal entry but the quest was not available to me. I believe what is happening is just that the incorrect cutscene is being played. Hope this helps reproduce the bug, I will see if I have any saves near that point. Other mods that I am using are the script to allow companion multiclass and also the white feather of multiclass.

Well then I am inclined to agree with you since that is the only problem I came across playing through the entire OC with your pack. You can send anyone who claims you created an SP bug to me, I will tell them they are wrong